Finding the Fourth Proportional to 2,858.05, 3,944.72 and 1,861.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,858.05 : 3,944.72 = 1,861.55 : x
2. Step 2: Convert to fraction form
   2,858.05/3,944.72 = 1,861.55/x
3. Step 3: Cross multiply
   2,858.05x = 3,944.72 × 1,861.55
4. Step 4: Simplify right side
   2,858.05x = 7,343,264.48
5. Step 5: Solve for x
   x = 7,343,264.48/2,858.05
6. Step 6: Final answer
   x = 2,569.33